fix: initialize `D_temp` in `Pairs_from_File()` #802

Job	Run time
build-cuda (ubuntu-22.04)	16m 26s
build-ui-qt	5m 28s
lint	44s
webapp mobile (ubuntu-22.04)	4m 32s
webapp desktop (ubuntu-22.04)	5m 45s
clang (ubuntu-24.04)	8m 4s
test debug (ubuntu-22.04)	7m 24s
test coverage (ubuntu-22.04)	41m 43s
clang openmp (ubuntu-24.04)	7m 56s
gcc (ubuntu-22.04)	7m 25s
test debug (macos-14)	4m 13s
clang (macos-14)	5m 18s
gcc openmp (ubuntu-22.04)	7m 39s
msvc (windows-2022)	12m 4s
clang openmp (macos-14)	7m 34s
clang (windows-2022)	8m 3s
nvcpp (ubuntu-22.04)	25m 51s
clang openmp (windows-2022)	8m 27s
test single-precision (ubuntu-24.04)	9m 15s
nvcpp cuda (ubuntu-22.04)	29m 40s
test single-precision (macos-14)	3m 25s
test pinning-and-defects (ubuntu-24.04)	9m 10s
deploy-package (ubuntu-latest)	5m 11s
deploy-pypi (ubuntu-latest)	4m 3s
deploy-package (macos-latest)	2m 32s
deploy-pypi (macos-latest)	1m 59s
deploy-package (windows-latest)	8m 38s
deploy-pypi (windows-latest)	8m 44s
draft-release	0s
	4h 27m 13s

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